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Oracle. Reference to combined value from mult columns and tables

By yverkhovykh ·
Tags: Software
select ru.num || bu.grid || gu.place comb_id from
ru
,bu
,gu
,ku
where ru.id = bu.id and ru.id = gu.id and ku.id = comb_id

doesn't work when i do it like this. complains that i can't reference to multiple tables.

please help

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